From: Justin Azoff <justin.azoff@gmail.com>
To: aforster@cloudflare.com
Cc: xdp-newbies@vger.kernel.org
Subject: Re: AF_XDP umem and jumbo frames?
Date: Mon, 24 Sep 2018 18:15:42 -0500 [thread overview]
Message-ID: <CAJL276DCPNAB_s=ZPHAbanWjQ4rGvo_rKJG+yxa1dP+-OCBfpw@mail.gmail.com> (raw)
In-Reply-To: <CAKxSbF09EOU4nvNLaVmMqb7hE-ZrKMd7SC+rVEAqeasG2HGRKg@mail.gmail.com>
I don't know if this affects AF_XDP as well, but XDP does not support
jumbo frames at all:
https://prototype-kernel.readthedocs.io/en/latest/networking/XDP/design/requirements.html#page-per-packet
On my test box running 4.18 if XDP is in use the MTU can not be set
higher than 3050.
On Mon, Sep 24, 2018 at 4:53 PM Alex Forster <aforster@cloudflare.com> wrote:
>
> What happens in the case where umem's chunk size is smaller than the
> NIC frame size, like when jumbo frames are enabled? I.e, a NIC using
> MTU ~9000 on an x86-64 machine with a page size of 4096.
>
> Alex Forster
--
- Justin
next prev parent reply other threads:[~2018-09-25 5:20 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-09-24 21:52 AF_XDP umem and jumbo frames? Alex Forster
2018-09-24 23:15 ` Justin Azoff [this message]
2018-09-25 16:43 ` Alex Forster
2018-09-27 0:55 ` Rob Sherwood
2018-10-04 6:44 ` Björn Töpel
2018-10-04 7:52 ` Jesper Dangaard Brouer
2018-10-04 14:48 ` Justin Azoff
2018-10-04 15:39 ` Alex Forster
2018-10-04 15:47 ` Rob Sherwood
2018-10-04 19:44 ` Jesper Dangaard Brouer
2018-10-05 18:47 ` Zvi Effron
2018-10-07 15:14 ` Jesper Dangaard Brouer
2018-10-05 19:56 ` Justin Azoff
2018-10-07 16:13 ` Jesper Dangaard Brouer
2018-10-07 17:48 ` Eric Leblond
2018-10-07 19:34 ` Johannes Berg
2018-10-06 20:02 ` Rob Sherwood
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